运行以下代码将显示什么值?
假设代码运行时的URL是:testscript.php?c=25
<?php
function process($c, $d = 25) {
global $e;
$retval = $c + $d - $_GET['c'] - $e;
return $retval;
}
$e = 10;
echo process(5);
?>
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